Venar's Rock III was the highest tier grand prize for the very first event in Elvenar. The only way to get it, originally, was to spend a considerable amount of diamonds. I am more likely to see the daily appearance of it several years later as a special gift rather than as a metric for dailies in general. The Elvenar chapter has introduced a wonder for buffing residences and magical residences. I think balancing around residences/magical residences makes more sense than balancing around the best event pay out to date.
When this did come back as a daily prize last year, and some people won lots of them, I think maybe Inno realized their mistake, since we have not seen it since. And when we got daily prizes during the Winter event that were better than Venar's III, we also had the shuffle system, so if someone got more than a couple of those buildings, they were very lucky.
And looking at the next event for the Air Ships, none of the set buildings even give population, and some of the better daily prizes do not either.
Speaking of those new daily prizes, there are still some good ones. There will be another seed-producing building that is basically equal in seeds per square per hour as the Festival Merchant and Savory Food Market. And there is a building that gives basically the same orcs per square per hour as the Orc Nest. While they are not better, I like that we are getting variety in buildings, so that we can change the looks of our cities without reducing output.